Micro knurled block style tread that extends onto the upper sidewall with a fast rolling center line Knurled block-shapped non-directional design benefits both acceleration and traction SRC - Standard Rubber Compound, combines the best attributes of low rolling resistance, extreme durability and tread longevity 4PLY - 4 ply casing for a robust durable tire and reduced chance of flats from pinches and punctures Standard 20x2.3 406 Wire Bk/Blk 65 910 60 SRC/4PLY NoUPC/EAN/GTIN: 047853643206